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Subject:  Re: How factor Social Security in retirement dra Date:  3/19/2019  7:40 PM
Author:  ptheland Number:  92500 of 97361

I'm sure Ray will disagree, but there's nothing easier to model than a known set of cash flows.

Using an anonymous annuity quote aggregator (so they're probably optimistic) 100k will get you about 1700 a month for 5 years - close enough to your social security age. That won't be adjusted for inflation, but we're also talking about only 5 years. So close enough.

Adjust the investment and monthly payment to approximate your Soc Sec benefit. Then subtract the cost of that annuity out of your investments and take 4% from what's left. For example, if you actually would get 1700 a month from Soc Sec, reduce your assets by 100k and use the remaining amount to determine your withdrawal rate. Then add the 1700 per month to that for your withdrawals until Soc Sec kicks in. At that point, reduce your withdrawals by 1700 a month and carry on.

Probably not a perfect model, but it's at least a place to start.

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